Internal-combustion engine



April 16, 1946.

w. B. BRONA'NDER INTERNAL-COMBUSTION ENGINE Filed Oct. 14, 1944 INVENTOR BY olmf ATTORNE Patented Apr. 16, 1946 UNITED STATES PATENT oFFicE 2,398,514 INTERNAL-conmUsTIoN'l-:Ndms Wilhelm B. Bronander. Montclair. N. J. Application october 14, 1944, serial Nb. 558,321 a claims. (ci. 12a- 177) y openings I9 and sloshes" back and forth in the vide means for cooling the valve stem guides or bushings, thereby eliminating freezing of the valves.

Further objects of the invention will appear from the following specification taken in connection with the drawing which forms a part of this application, and in which there is shown a sectional elevation through a' portion of the head of the engine illustrating valve mechanism embodying the invention.

In the particular embodiment of the invention illustrated, there is shown a portion I0 of the head of an engine having mounted therein a valve guide II in which is reciprocatably mounted a valve stem I2. The single valve stem as shown is hollow and has two outwardly dared portions of the stem with which springs 29 of the usual construction cooperate. to close the valve. The valve is operated in its opening movement by a rocker arm 30.

The hollow portion ofthe valve stem I2 is partially nlled with a suitable cooling medium, such as sodium or suitable salts. Byreason of the particular construction of the valve cap and flared portions of the lower end of the valve stem, the cooling medium is forced laterally through the valve stem, thus materially assisting in the cooling of the valve. 2

The cap I5 is preferably formed of Nichrcme metal which is highly resistant to heat and is welded at I6 to the flared portion I3 of the valve stem. which is preferablviormed of some material such as stainless steel.

Although one specific embodiment of the invention has been particularly shown and described, it will be understood that the invention is capable of modification and that changes in the construction and in the arrangement of the various cooperating parts may be made without 2l departing from the spirit or scope of the inven- I3 and I4 at the lower end of said lsingle stem. a

A cap I5 is secured, as by welding shown at I8, to the iiared portion I3. The cap Il forms the valve head which seats against the valve seat I'I and, furthermore, has an inwardly extending conical portion I8 at the center thereof.l Openings I9 are formed in the tapered portion I4 at the 35 lower end thereof and circular openings 20 are formed in the upper portion of the wall of the tapered portion I4. The conical portion I8 promotes the circulation of the cooling medium in the valvecap and directs the medium laterally through the openings I0.

The portion I4. which may be carried by the stem or by the head or cap, may be tapered as shown or may have any other desired shape or configuration. and forms a support for the cap I5 to prevent buckling or .collapsing of the cap. Thus the cap can be made much lighter, reducing the weight of the valve.

The upper end of the valve stem I2 has a central filling opening 2B which is normally closed by a pin 2B having a head 21. The head 21 forms the central portion of the flanged upper end Il l tion, as expressed in the following claims.

What I claim is:

l. Valve structure comprising a hollow valve stem having a nlling'opening at one end and a hollow valve at the other end, and aplug for closing the filling opening forming a closed chamber in the valve. said valve having an inwardly extending conical portion at the center thereof and an outwardly ilared internal wall forming a support for the valve head and provided with openings to facilitate circulation of the cooling medium in the hollow valve and stem.

2. Valve structure comprising a single thickness, closed, hollow valve stem and a hollow valve head carried by the stem, and bracing and supporting meansin the head extending from the stem tothe valve head to prevent buckling or collapsing of the valve head.

u 3. Valve structure comprising a single thickn to prevent buckling or collapsing of the valve head.

WILHELM B. BRONANDER. 

